The polymer matrix composite (PMC) in use today is generally made of synthetic fibers which are expensive and not environmentally friendly. The use of synthetic fibers can be replaced with natural fibers, which are more environmentally friendly at a lower price. The natural fiber material used in this study is made from husks, with a particle size of 500 µm (mesh 35). In the PMC manufacturing process, rice husks are mixed with polypropylene (PP) and maleic anhydride polypropylene (MAPP) with a composition of 10 wt% RH, 85 wt% PP and 5 wt% MAPP. PMC materials using natural fibers are called biocomposite materials. The result of mixing PMC with natural fibers in the form of pellets is then carried out by the injection process using an injection molding machine. The printed results are in the form of tensile test specimens based on ASTM D 638-03 type V testing standards and impact test specimens based on ASTM D 256-04 testing standards. The research was conducted by optimizing the responses i.e. tensile strength and impact strength of the biocomposite material in the injection molding machine process, whereas varied process parameters, namely barrel temperature, injection pressure, holding pressure, injection velocity were selected as process parameters. The backpropagation neural network (BPNN) training method is used to recognize the pattern of the relationship between process parameters and response parameters based on the previous experiment, while the genetic algorithm (GA) optimization method is to determine the variation settings for process parameters that can optimize tensile and impact strength. The results of the BPNN training have a 4-9-9-2 network architecture consisting of 4 input layers, 2 hidden layers with 9 neurons, and 2 neurons in the output layer. Optimization with GA produces a combination of variable process parameters barrel temperature 217•C, injection pressure 55 Bar, holding pressure 41 Bar and injection velocity 65 mm/sec. The results of statistical validation using one sample T test show that the average value of tensile strength and impact strength from the results of the confirmation experiment is the same as the value of the tensile strength and impact strength of the optimization prediction.
Kegiatan sekolah minggu merupakan kegiatan pembelajaran Alkitab untuk anak-anak beragama Kristen. Kegiatan ini dilakukan pada hari minggu, dalam kegiatan ini juga anak-anak diajarkan tentang Alkitab, bernyanyi lagu kristiani dan berdoa. Penelitian ini bertujuan untuk merancang dan membangun aplikasi media pembelajaran. Dalam proses belajar mengajar seringkali memiliki beberapa masalah yaitu kurangnya media peraga yang dapat membantu proses pemberian materi yang ada. Oleh karena itu dikembangkan sebuah aplikasi Media Pembelajaran untuk membantu proses belajar mengajar pada sekolah minggu. Aplikasi Media Pembelajaran berbasis android ini merupakan solusi untuk menjadi alat peraga digital dalam proses pembelajaran Alkitab di sekolah minggu. Dalam penyampaian cerita Alkitab, aplikasi ini menyediakan fitur cerita dalam bentuk gambar dan suara. Metode pengembangan sistem yang digunakan dalam penelitian ini adalah model Waterfall, dan aplikasi dibangun menggunakan bahasa pemograman ActionScript 3.0 pada software Adobe Animate CC. Sistem pada aplikasi ini menyediakan tiga pilihan menu pembelajaran yaitu Lagu-lagu Sekolah Minggu, cerita Alkitab bergambar, dan kuis Alkitab. Sistem akan menampilkan pembelajaran sesuai dengan pilihan yang dilakukan oleh user. Materi pembelajaran pada sistem menggunakan Bahasa Indonesia. Tampilan pembelajaran dalam sistem menggunakan teks, gambar, audio dan kuis berupa teks untuk mempermudah anak dalam proses pembelajaran.
The alternator on the motor is one component of the vehicle that can be used to improve its utilization. Modifications to the alternator on the vehicle are made to increase electric power. The working principle of an electric generator is in accordance with the law of faraday if a conductor is rotated in a magnetic field until it crosses the magnetic force line (GGM), it will cause an electric force line (GGL) in volts at the end of the conductor. In the alternator to be used, the lighting coil resistance is 0.24 - 0.36 Ω and the charging is 12.3 - 13.3 V at 1500 rpm. The research conducted was an experiment by comparing the alternator output voltage before it was modified with the alternator output that had been modified. Modification of the alternator is done by the method of load variation and replacement of the diameter of the coil along with the number of turns on the alternator. Measurement of alternator before and after modification shows results that are directly proportional to the output of the alternator at 1,000 rpm - 8,000 rpm. The results of three tests can be concluded that the modification of the alternator has increased from 6.42 A for the standard alternator to 13.7 A for the modification alternator.
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